UMC CFO Sells $12.3M in Stock — Largest Insider Sale in Recent Months
UMC has more than doubled off its 52-week low of $6.56.
Summary
UMC's CFO sold 1.9 million shares for ~$12.3 million, the largest insider sale in recent months, reducing his direct holdings by over a third.
Key Events · Ownership and Investor Activity · UMC
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CFO Sells 1.9M Shares
CFO & SVP Liu Chitung sold 1,900,000 common shares at NT$154.89 per share, generating NT$294,291,000 (~US$12.3 million) in proceeds.
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Stake Reduced by 36%
Post-transaction direct holdings fell to 3,322,917 shares (including 1,210,000 unvested RSAs), a 36.4% reduction from prior direct ownership.
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Largest Insider Sale in Months
This is the largest insider sale by dollar value in recent months, surpassing the $7 million in aggregate sales by multiple officers reported in April 2026.
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Sale Amid Strong Stock Performance
The sale occurs as UMC shares have rallied on strong sales growth (22.85% YoY in June) and positive Q1 results, potentially locking in gains.
Analysis · UMC · Manufacturing
CFO & SVP Liu Chitung sold 1.9 million shares for NT$294.3 million (~US$12.3 million), reducing his direct stake by over 36%. This is a significant cash-out by a key insider, coming amid a strong stock rally and positive sales momentum. While the sale represents only 0.48% of market cap, it is the largest insider transaction in recent months and may signal caution from a top executive despite the company's robust operational performance.
How filings like this one have moved
In the 30 days to Sep 14, 2026, 35.8% of the 1045 measured filings Wiseek scored 8 moved their stock by 5% or more by the next session's close. The median move was -0.43%. These are measured outcomes after filings of this importance, not a forecast for this one.
Measured one observation per ticker per day, after exclusions. Current figures: Filing Impact Tracker · open dataset
At the time of this filing, UMC was trading at $23.87 on NYSE in the Manufacturing sector, with a market capitalization of approximately $61B. The 52-week trading range was $6.56 to $28.96. This filing was assessed with negative market sentiment and an importance score of 8 out of 10.